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 Post subject: Help ID tube
PostPosted: Jan Tue 25, 2011 7:23 am 
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I have another mystery tube for you guys. It appears to be a power output tube of some sort.

The glass bulb is a little odd near the base. Perhaps it's foreign ?

Any ideas ?

Thanks.

Image

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 Post subject:
PostPosted: Jan Tue 25, 2011 7:50 am 
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Looks like a 6L6.

Gene

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PostPosted: Jan Tue 25, 2011 8:31 am 
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Ah, yes. So it is. I hadn't seen one in the ST style before.
I'll try to find a better challenge next time :wink:


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PostPosted: Jan Tue 25, 2011 2:43 pm 
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The GE tube sitting next to it looks like a 6DZ7

Jim Cross


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 Post subject:
PostPosted: Jan Tue 25, 2011 3:49 pm 
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The bottom tube has a lot of elements. More than a pentode. Due to the shape also believe it's foreign.

Jim identified top tube. It's a dual pentode.

http://tdsl.duncanamps.com/show.php?des=6DZ7

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 Post subject:
PostPosted: Jan Tue 25, 2011 4:39 pm 
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What I see on the big one is lots of supports plus fins on the anode and with the glare its hard to see more details in that area.

As Norm mentioned it could be European or maybe one of those seldom seen Raytheon RK versions of a regular tube.

Carl


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 Post subject:
PostPosted: Jan Tue 25, 2011 7:52 pm 
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It tests good as a 6L6. From what I can see through the glass, it matches the structure of a 6L6 as well.

The other tube is indeed a NOS 6DZ7.


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 Post subject:
PostPosted: Jan Wed 26, 2011 3:16 am 
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Bottom tube is a Mullard EL-37, close relative of a 6L6. Original output tube in Fisher 80AZ amplifier and others. Should have some small code numbers on the glass near the base.

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 Post subject:
PostPosted: Jan Wed 26, 2011 5:26 am 
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The tube in question is a Mullard EL37. I have a pair of NOS ones, and the bulb geometry and internal structure are identical. They would test as a 6L6, too. Case closed!

--Bob

[Edit: Ooops, should have read all the way to the end! Well, consider this post as confirmation...]


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 Post subject:
PostPosted: Jan Wed 26, 2011 5:42 am 
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Thanks! Yes, there are some faint codes. Looks like R61 B8H ?


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 Post subject:
PostPosted: Jan Wed 26, 2011 5:52 am 
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"R6" is the type code for the EL37. "R61" is version 1 (however in some cases, version one is preceded by version 0)

B = Mullard Blackburn factory
8 = 1958
H = August

Jim Cross


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